Confusion: How does SQLiteOpenHelper onUpgrade() behave? And together with import of an old database backup?

Question

let\'s assume I have a database table test_table with 2 columns and a corresponding create script in the SQLiteOpenHelper:

DB_VERSION = 1:
public void onCrea         


        

Answer 1

below psuedo code shows increamental upgrade

@Override
    public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
        switch(oldVersion) {

        case 2:
                //upgrade logic from version 2 to 3
        case 3:
                //upgrade logic from version 3 to 4
        case 4:
                //upgrade logic from version 4 to 5
                break;
        default:
                throw new IllegalStateException(
                "onUpgrade() with unknown oldVersion" + oldVersion));
        }
    }

By incremental upgrade i mean - Notice the missing break statement in case 2 and 3

say if the old version is 2 and new version is 4, then the logic will upgrade the database from 2 to 3 and then to 4

if old version is 3 and new version is 4, it will just run the upgrade logic for 3 to 4

keep adding new cases for every new database version upgrade that will do the increamental changes